You have implemented GRES on the routers in your network. All routers are using OSPF. You want to ensure that traffic continues to flow uninterrupted if a Routing Engine switchover occurs.
Which two features would accomplish this task? (Choose two.)
A . Enable the VirtualRouter Redundancy Protocol.
B . Enable nonstop active routing.
C . Enable graceful restart.
D . Enable nonstop forwarding with stateful switchover.
Answer: B,C